TW202002935A - Warm sensation-imparting cosmetic preparation - Google Patents

Abstract

The purpose of the present invention is to provide a water-in-oil warm sensation-imparting cosmetic preparation which exhibits excellent warm sensation-imparting effect, while having good feeling of use and excellent storage stability. The present invention relates to a warm sensation-imparting cosmetic preparation which is characterized by containing a polyhydric alcohol, an oil-phase thickening agent, an emulsifying agent and water.

Description

Warm cosmetics

The present invention relates to a warm-sense cosmetic that imparts a warm sensation when applied to the skin. More specifically, the present invention relates to a water-in-oil temperature-sensitive cosmetic having excellent emulsification stability, exhibiting a cosmetic effect, and having a good sense of use.

Generally, it is known that imparting a moderate temperature sensation to the skin promotes blood circulation of the skin, increases metabolism, and can obtain blood color improvement effects, relaxation effects, fatigue recovery effects, and the like. Therefore, in order to anticipate these effects, an operation of blending a heat generating substance into cosmetics is performed. As a heat-generating substance formulated in cosmetics, moisturizing agents such as polyols, zeolites, metal salts, metal oxides, etc. are widely used in the industry. These are all hygroscopic and bring warmth to the skin by generating heat when in contact with moisture on the skin.

In Patent Document 1, in terms of obtaining a moderate viscosity and an excellent temperature-sensing effect, it is proposed to emulsify a polyol using a specific nonionic surfactant to become a temperature-sensing polyol-in-oil type. cosmetic. In addition, Patent Document 2 proposes to disperse zeolite having a high heat build-up in a polyol solvent to improve the effect of imparting temperature. As described above, various bases have been proposed in the industry as temperature-sensitive cosmetics. The cosmetics of Patent Document 1 are oil-in-water bases, and the polyol directly contacts the skin, so the sticky feeling is remarkably high. Therefore, it is a non-moisturizing type cleanser that is applied to the skin and rinsed after a certain period of time. In addition, the cosmetic of Patent Document 2 is a leave-on type, but it is a non-aqueous system, so it is not easy to stably prepare an aqueous solution containing a salt-type medicament having a cosmetic effect.

Therefore, there is a need for a water-in-oil base that exhibits an excellent temperature-imparting effect, is excellent in stability and usability, and can also be formulated with whitening ingredients and other cosmetically effective agents. [Prior Technical Literature] [Patent Literature]

Patent Literature 1: Japanese Patent Laid-Open No. 2014-37404 Patent Document 2: Japanese Patent Laid-Open No. 2016-193841

[Problems to be solved by the invention]

An object of the present invention is to provide a water-in-oil temperature-sensing cosmetic that exerts an excellent temperature-sensing effect, has a good sense of use, and has excellent storage stability. [Technical means to solve the problem]

The inventors of the present invention conducted intensive studies, and as a result, found that by blending polyols, oil-phase thickeners, emulsifiers, and water, the above-mentioned objects can be achieved, and the present invention has been completed. That is, the present invention is characterized by a water-in-oil temperature-sensitive cosmetic, which contains: Polyol, Oil phase tackifier, Emulsifier, and water. [Effect of invention]

The temperature-sensing cosmetics of the present invention exert an excellent temperature-sensing effect and also have excellent emulsion stability. In addition, the temperature-sensing cosmetics of the present invention can be made into water-in-oil type temperature-sensing cosmetics, which can prevent the polyol from directly contacting the skin. Therefore, although a high-profile moisturizing agent (polyol) is provided, it is the same as the previous oil-in-water type. Compared with temperature-sensing cosmetics of oil-in-polyol type, it suppresses stickiness. Therefore, the temperature-sensing cosmetics of the present invention can also be used as a leave-on type temperature-sensing cosmetics base. In addition, since water can be adjusted, it is also possible to mix salt-type medicines with whitening ingredients and other cosmetic effects.

The temperature-sensing cosmetics of the present invention are characterized by containing polyol, oil-phase thickener, emulsifier and water as essential ingredients. Hereinafter, the present invention will be described in detail.

<polyol> The polyol used in the temperature-sensing cosmetics of the present invention refers to a person who imparts a temperature sensation when applied to the skin. Specific examples are not limited, and examples include glycerin, diglycerin, polyglycerin, 1,3-butanediol, ethylene glycol, propylene glycol, dipropylene glycol, polyethylene glycol (such as PEG-8), polypropylene glycol, Polyethylene glycol-polypropylene glycol, methyl glucitol-10, trimethylolethane, trimethylolpropane, erythritol, pentaerythritol, sorbitan, glucose, sorbitol, maltose Alcohol, sucrose, raffinose, hexanediol, 1,2-pentanediol, trehalose, etc. Among these, it is preferable to use glycerin, dipropylene glycol, polyethylene glycol, 1,3-butanediol, methylglycol-10, etc., as appropriate.

In addition, through the preparation of polyol, it can also produce a warming effect and introduce it to bright and bloody skin, while using a high moisturizing effect to prevent dry makeup.

The blending amount of the polyol in the cosmetic of the present invention is 20% by mass or more relative to the total amount of the cosmetic, preferably 20 to 80% by mass, and more preferably 30 to 70% by mass. If the blending amount of the polyhydric alcohol is less than 20% by mass, the temperature feeling during use cannot be sufficiently obtained.

<Oil phase tackifier> The oil-phase thickener used in the temperature-sensing cosmetics of the present invention refers to one that can impart viscosity to the oil phase. Examples include emulsifying or non-emulsifying cross-linked silicone elastomers, dextrin fatty acid esters, hydrophobized modified polysaccharides, fatty acids, waxes, and the like. Among them, in the present invention, from the viewpoint of suppressing the sticky feeling, it is preferable to use a non-emulsifying crosslinked silicone elastomer.

The non-emulsifying cross-linked silicone elastomer is not particularly limited, and examples include methyl polysiloxane cross-linked polymer, methyl phenyl polysiloxane cross-linked polymer, and vinyl dimethicone. Oxyalkyl/Lauryl Dimethicone Crosspolymer, Lauryl Dimethicoxyethyl Dimethicone/Divinyl Dimethicone Crosspolymer, Alkyl (C30-45) Cetearyl dimethyl polysiloxane cross-linked polymer, cetearyl dimethyl polysiloxane cross-linked polymer, etc. These non-emulsifying crosslinked silicone elastomers can be used in the form of swelling products in the form of swelling in various oils such as polysiloxane oil, mineral oil, triisooctanoic acid glyceride, squalane, etc. . Specific examples include the following.

Examples of methyl polysiloxane cross-linked polymers include: 9040 silicone elastomer blend, 9041 silicone elastomer blend, 9045 silicone elastomer blend, EL-8040ID silicone Oxygen organic blends (above manufactured by Dow Corning Toray) and other dimethyl polysiloxane crosslinked polymers, or KSG-15, KSG-16, KSG-1610 (above manufactured by Shin-Etsu Chemical Industry Co., Ltd.) Polysiloxane/vinyl dimethicone cross-linked polymer, KSP-100 (manufactured by Shin-Etsu Chemical Co., Ltd.) and other vinyl dimethicone/methicone silsesquioxane cross-linked Polymers, polymethyl silsesquioxanes such as TOSPEARL 150KA (made by Momentive Performance Materials), etc.

Examples of the methylphenyl polysiloxane cross-linked polymer include KSG-18A (dimethicone/phenylvinyl dimethicone cross-linked polymer, manufactured by Shin-Etsu Chemical Co., Ltd.), etc. Methyl silicone/phenyl dimethicone cross-linked polymer, etc.

Examples of the vinyl dimethicone/lauryl dimethicone cross-linked polymer include: KSG-41A, KSG-42A, KSG-43, KSG-44 (the above is manufactured by Shin-Etsu Chemical Co., Ltd.) Wait.

As a swelling product of lauryl polydimethylsiloxyethyl dimethicone/divinyl dimethicone crosspolymer, KSG-042Z, KSG-045Z (the above is Shin-Etsu Chemical Co., Ltd.) Manufactured by an industrial company), etc.

Examples of the alkyl (C30-45) cetearyl dimethyl polysiloxane cross-linked polymer include VELVESIL 125 and VELVESIL 034 (above manufactured by Momentive Performance Materials).

Examples of the cetearyl dimethicone crosslinked polymer include VELVESIL DM (manufactured by Momentive Performance Materials) and the like.

The blending amount of the oil phase tackifier in the cosmetics of the present invention is more than 1.25% by mass and 15% by mass or less relative to the total amount of cosmetics, preferably 1.26-12% by mass, and more preferably 1.27-10% by mass. More preferably, it is 1.28 to 10% by mass. If the blending amount of the oil phase tackifier is 1.25% by mass or less, the emulsion stability tends to be poor or the usability is poor. On the other hand, if it exceeds 15% by mass, it may be difficult to prepare stable cosmetics. situation.

As the oil phase tackifier of the present invention, one or more types selected from the above-mentioned non-emulsifying crosslinked silicone elastomers may be used in combination.

<Emulsifier> The emulsifier used in the temperature-sensing cosmetics of the present invention refers to one that has relatively high lipophilicity and can exert the emulsifying and stabilizing effect of the water-based component and the oil-based component of a highly formulated polyol. In the present invention, polyether modified polysiloxane or organic modified clay minerals having specific properties can be preferably used.

The above-mentioned so-called polyether-modified polysiloxane having specific properties used as the emulsifier of the present invention is one whose HLB is 8.0 or less, and the viscosity at 25°C is 10,000 mm ² /s or more, preferably 15,000 mm ² /s or more, and more preferably 20,000 mm ² /s or more. If the viscosity is less than 10,000 mm ² /s, good emulsion stability cannot be obtained. Specific examples of polyether-modified polysiloxane include PEG/PPG (Poly Propylene Glycol, polypropylene glycol)-19/19 dimethicone (trade name "BY11-030", HLB=3, viscosity 30,000 mm ² /s; made by Dow Corning Toray)).

As the organically modified clay mineral used in the present invention, it is one of the colloidal hydrous aluminum silicates having a three-layer structure, which can be expressed by the following general formula (1) using a quaternary ammonium salt type cationic surfactant Modified by clay minerals. [Chem. 1] (X,Y) _2-3 (Si,Al) ₄ O ₁₀ (OH) ₂ Z _1/3 ·nH ₂ O (1) In the above formula, X is Al, Fe(III), Mn( III) or Cr(III), Y is Mg, Fe(II), Ni, Zn or Li, and Z is K, Na or Ca.

Specifically, a quaternary ammonium salt-type cationic surfactant can be used for natural or synthetic montmorillonite, saponite, lithium bentonite, etc. (in this case, the (OH) group in the formula is substituted with fluorine) Montmorillonite group (as a commercial product, magnesium aluminum silicate, Kunipia, laponite, etc.), and synthetic mica known as the name of sodium silicic acid or sodium or lithium mica (as a commercial product) , Dimonite; manufactured by TOPY INDUSTRIES, etc.) and obtained by processing clay minerals.

式中，R¹ 表示碳數10～22之烷基或苄基，R² 表示甲基或碳數10～22之烷基，R³ 及R⁴ 表示碳數1～3之烷基或羥基烷基，X表示鹵素原子或硫酸甲酯殘基。The quaternary ammonium salt type cationic surfactant used here is represented by the following general formula (2). [Chem 2]

In the formula, R ¹ represents a C 10-22 alkyl or benzyl group, R ² represents a methyl group or a C 10-22 alkyl group, R ³ and R ⁴ represent a C 1 to 3 alkyl group or a hydroxyalkyl group Group, X represents a halogen atom or a methyl sulfate residue.

Examples of the quaternary ammonium salt-type cationic surfactant include dodecyltrimethylammonium chloride, myristyltrimethylammonium chloride, cetyltrimethylammonium chloride, and hard chloride. Fatty trimethyl ammonium, arachidyl trimethyl ammonium chloride, behenyl trimethyl ammonium chloride, myristyl dimethyl ethyl ammonium chloride, cetyl dimethyl ethyl ammonium chloride, Stearyl dimethyl ethyl ammonium chloride, arachidyl dimethyl ethyl ammonium chloride, behenyl dimethyl ethyl ammonium chloride, myristyl diethyl methyl ammonium chloride, whale chloride Waxy diethyl methyl ammonium, stearyl diethyl methyl ammonium chloride, arachidonyl diethyl methyl ammonium chloride, behenyl diethyl methyl ammonium chloride, benzyl dimethyl chloride Myristyl ammonium, benzyl dimethyl cetyl ammonium chloride, benzyl dimethyl stearyl ammonium chloride, benzyl dimethyl behenyl ammonium chloride, benzyl methyl ethyl chloride Cetyl ammonium, benzyl methyl ethyl stearyl ammonium chloride, dibenzyl dihydroxy ethyl ammonium chloride, and equivalent bromide, etc., and dipalmityl propyl ethyl ammonium sulfate methyl salt Wait. In the implementation of the present invention, one or more of these can be arbitrarily selected.

Representative examples of organically modified clay minerals include: dimethyl distearyl ammonium bentonite (distearyl dimethyl ammonium lithium bentonite), dimethyl alkyl ammonium lithium bentonite, benzyl Lithium dimethyl stearyl ammonium bentonite, distearyl dimethyl ammonium chloride treated aluminum magnesium silicate, etc. Among them, particularly preferred is lithium dimethyl distearyl ammonium bentonite. Examples of commercially available products include BENTONE 27 (benzyldimethyl stearyl ammonium chloride-treated lithium bentonite: manufactured by Elementis Japan) and BENTONE 38VCG (distearyl dimethyl ammonium chloride-treated lithium bentonite: Elementis Japan)).

The blending amount of the emulsifier in the cosmetic of the present invention is 0.1 to 5% by mass, preferably 0.2 to 4% by mass, and more preferably 0.4 to 3% by mass relative to the total amount of cosmetics. If the blending amount is less than 0.1% by mass, the viscosity is not easy to obtain and the stability is poor. If the blending amount exceeds 5% by mass, the sticky or powdery feeling from the emulsifier will occur, which is not good in usability.

<Water> In the temperature-sensitive cosmetics of the present invention, water (ion exchanged water, purified water, natural water, etc.) can be formulated as an aqueous solvent. Among them, if an aqueous solvent is present, the temperature-sensing effect is reduced. Therefore, in the case of formulating an aqueous solvent, it should be suppressed to 10% by mass or less, preferably 8% by mass or less, and more preferably 5 relative to the total amount of temperature-sensitive cosmetics. Mass% or less. Therefore, in the temperature-sensitive cosmetic of the present invention, from the viewpoint of sufficiently dissolving agents such as whitening agents and obtaining a sense of temperature, it is preferable to set the amount of water to be 0.1 to 10% by mass, or 1 to 10% by mass, more preferably 0.1-8% by mass, or 1-8% by mass, still more preferably 1-5% by mass.

<Whitening agent> The previous leave-on type temperature-sensing cosmetics are non-aqueous, and it is difficult to formulate water-soluble agents. On the contrary, the temperature-sensing cosmetics of the present invention are characterized by containing water, so they can be formulated with water-soluble agents.

The whitening agent to be formulated is not particularly limited as long as it is a whitening agent to be formulated in general cosmetics, and examples include ascorbic acid (vitamin C), tranexamic acid, kojic acid, tannin, and arbutin. , Alkoxysalicylic acid, and salts or derivatives thereof. More specific examples include sodium L-ascorbate, magnesium L-ascorbate, L-ascorbic acid glucoside, 2-O-ethyl-L-ascorbic acid, 3-O-ethyl-L-ascorbic acid, 4 -Sodium salt of methoxysalicylic acid, potassium salt of 4-methoxysalicylic acid, etc. In the present invention, potassium 4-methoxysalicylate can be preferably used.

In addition, pharmaceuticals other than whitening pharmaceuticals can also be formulated. For example, examples of the medicine include vitamin A derivatives such as vitamin A, vitamin A palmitate, and vitamin A acetate, vitamin B6 hydrochloride, vitamin B6 tripalmitate, vitamin B6 dioctanoate, Vitamin B2 and its derivatives, vitamin B12, vitamin B15 and its derivatives such as vitamin B, α-vitamin E, β-vitamin E, vitamin E acetate and other vitamin E, vitamin D, vitamin H, pantothenic acid, Vitamins such as pantethine; γ- oryzanol, allantoin, glycyrrhizic acid (salt), glycyrrhetinic acid, stearyl glycyrrhetinate, juniper alcohol, myrrholol, eucalyptus, resveratrol, Inositol, saikosaponin, ginsenoside, loofah saponin, saponin saponin and other saponins, panthenol ether, arbutin, cephalocrin, etc. Sawgrass, mallow, Chinese medicine, thyme, angelica, bitter orange, birch, equisetum, loofah, horse chestnut, saxifrage, skullcap, arnica, lily, wormwood, peony, aloe, gardenia, Extracts of plants such as cherry leaves and pigments such as β-carotene. The formulation amount of the medicament of the present invention is arbitrarily determined within the range of the formulation amount that can be dissolved in warm-sense cosmetics. In cosmetics, from the viewpoint of obtaining a sufficient pharmaceutical effect, it is preferably 0.5 to 4% by mass, and more preferably 1 to 3% by mass.

<Polyether-modified polysiloxane> In the present invention, by blending polyether-modified polysiloxane with an HLB of 8.0 or less and a viscosity of less than 10,000 mm ² /s at 25°C, the emulsion stability can be further improved . Among them, those having no alkyl chain in the side chain and having a polyoxyalkylene group in the side chain of the linear or branched polysiloxane skeleton are preferred.

Specific examples of the polyether-modified polysiloxane with a linear polysiloxane skeleton include: PEG-3 dimethicone (trade name "KF-6015", HLB=4.5, viscosity 150 mm ² /s; manufactured by Shin-Etsu Chemical Co., Ltd.), PEG-9 methyl ether dimethyl polysiloxane (trade name "KF-6016", HLB=4.5, viscosity 150 mm ² /s; manufactured by Shin-Etsu Chemical Co., Ltd.), PEG- 10 Dimethicone (trade name "KF-6017P", HLB = 4.5, viscosity 850 mm ² /s; manufactured by Shin-Etsu Chemical Co., Ltd.), PEG-12 dimethicone (trade name "SH3772M", HLB = 6, viscosity 1,050 mm ² /s, trade name "SH3773M", HLB = 8, viscosity 650 mm ² /s, trade name "SH3775M", HLB = 5, viscosity 1,600 mm ² /s; all of the above are Dow Corning Toray), PEG/PPG-20/22 butyl ether dimethicone (trade name "KF-6012", HLB=7.0, viscosity 1,600 mm ² /s; manufactured by Shin-Etsu Chemical Co., Ltd.), etc.

As specific examples of polyether modified polysiloxane whose polysiloxane skeleton is branched, there may be mentioned: PEG-9 polydimethylsiloxyethyl dimethicone (trade name "KF-6028") , HLB=4, viscosity 900 mm ² /s; manufactured by Shin-Etsu Chemical Co., Ltd.), lauryl PEG-9 polydimethylsiloxyethyl dimethicone (trade name "KF-6038", HLB= 3. Viscosity 700 mm ² /s; manufactured by Shin-Etsu Chemical Co., Ltd.), cetyl PEG/PPG-10/1 dimethicone (trade name "KF-6048", HLB=3.5, viscosity 2,700 mm ² / s; manufactured by Shin-Etsu Chemical Industry Co., Ltd.).

The blending amount of the polyether-modified polysiloxane in the cosmetic of the present invention is 0.1 to 10% by mass or less relative to the total weight of the cosmetic, preferably 0.3 to 6% by mass, and more preferably 1 to 5% by mass.

<oil content> In the temperature-sensitive cosmetics of the present invention, in order to improve the feeling of use when applied to the skin, it is preferable to blend oil. As the oil component, as long as it can be used in general cosmetics, it can be used without particular limitation.

Examples include: linseed oil, camellia oil, Australian walnut oil, corn oil, olive oil, calyx pear oil, camellia oil, castor oil, safflower oil, almond oil, Ceylon cinnamon oil, jojoba oil, grape oil, Oils such as sunflower oil, almond oil, rapeseed oil, sesame oil, wheat germ oil, rice germ oil, rice bran oil, cottonseed oil, soybean oil, peanut oil, tea seed oil, evening primrose oil; heptanoic acid, caprylic acid, nonanoic acid, Fatty acids such as capric acid, pentadecanoic acid, heptadecanoic acid, nonadecanoic acid, isostearic acid, oleic acid, linoleic acid, hypolinolenic acid, arachidonic acid; pentaerythritol tetraoctanoate, whale caprylate Wax ester, hexyl laurate, isopropyl myristate, octyl myristate dodecyl ester, octyl palmitate, isopropyl stearate, octyl isopalmitate, isodecyl oleate, ethyl Cetyl hexanoate and other esters; liquid paraffin, squalane, squalene, olefin oligomers, hydrogenated polydecene, paraffin, isoparaffin, octane, decane, dodecane, isododecane Alkanes, hexadecane, isohexadecane and other hydrocarbons; octanol, isostearyl alcohol, oleyl alcohol and other higher alcohols; dimethyl polysiloxane, methyl phenyl polysiloxane, methyl hydrogen poly Chain polysiloxane such as siloxane, cyclic polysiloxane such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecylcyclohexasiloxane, or octyl methylpolysiloxane Polysiloxane oils such as oxane.

In the cosmetics of the present invention, a plurality of kinds of the above-mentioned oils can be combined and formulated. The blending amount of the oil is 10 to 50% by mass relative to the total amount of cosmetics, more preferably 15 to 40% by mass, and still more preferably 15 to 35% by mass. If the amount of oil content is less than 10% by mass, the external oil phase is small, so it is difficult to emulsify, and the lightness of the application to the skin or the goodness of extension cannot be fully obtained. If it exceeds 50% by mass, it is prepared , There is less internal water phase, so there is a case where viscosity is not easy to obtain and stability is impaired.

<Other ingredients> In the temperature-sensing cosmetics of the present invention, in addition to the above-mentioned components, other components such as powder components, ultraviolet protection agents, and various aqueous solvents used in general cosmetics can be appropriately formulated as needed within the range that does not impair the effects of the present invention. , Tackifier, metal ion blocking agent, sugar, amino acid, organic amine, pH adjuster, stabilizer, skin nutrient, antioxidant, antioxidant aid, fragrance, etc.

The average emulsified particle size of the water droplets constituting the temperature-sensitive cosmetic of the present invention is 10 μm or less, and more preferably 5 μm or less. By reducing the average emulsified particle size of water droplets, the emulsification stability is excellent.

、10 mm針入)測定之硬度為6以上，較佳為8以上，更佳為10以上。可併用蠟等而製成軟膏狀。具有此種硬度之本發明之乳化化妝品之穩定性優異，例如若填充至瓶容器中，則不會流動而保持適度之硬度。The temperature-sensing cosmetics of the present invention use a rheometer (11.3 mm at 25°C

, 10 mm needle penetration) The measured hardness is 6 or more, preferably 8 or more, more preferably 10 or more. It can be combined with wax to make ointment. The emulsified cosmetics of the present invention having such hardness are excellent in stability, for example, if filled into a bottle container, they will not flow and maintain a moderate hardness.

The feature of the warm-feeling cosmetics of the present invention is that it is a one-layer type. The temperature-sensing cosmetics of the present invention have good emulsification stability even when they are formulated with a water-soluble agent. Although a high-profile moisturizing agent is provided, they have no sticky feeling and have an excellent use feeling. Therefore, the temperature-sensing cosmetics of the present invention can be widely applied to cosmetics. For example, they can be provided in any form such as lotions, beauty liquids, creams, massage cosmetics, sunscreen cosmetics, foundations, compacts, lipsticks, rouge, and eye shadows.

The temperature-sensing cosmetics of the present invention can be manufactured by conventional methods. As an example, a water phase component and an oil phase component are prepared by stirring and mixing the water phase component and the oil phase component separately, and the water phase portion is added to the oil phase portion while stirring and mixing. Examples

Hereinafter, the present invention will be described in more detail with examples, but the present invention is not limited by these examples. Regarding the blending amount, unless otherwise specified, it indicates mass%. Prior to the examples, the evaluation method used in the present invention will be described.

(1) Temperature effect Ten professional functional inspectors conducted actual use tests on the prepared samples. Specifically, the prepared sample was applied to the face of each functional inspector, and the temperature sensation was evaluated according to the following criteria. <Evaluation criteria> A: More than 8 professional functional inspectors believe that they have a warming effect. B: More than 5 professional functional inspectors and less than 8 believe that they have a warming effect. C: There are more than 3 professional functional inspectors and less than 5 think it has a warming effect. D: Less than 3 professional functional inspectors believe that they have a warming effect.

(2) Stability After preparation, each sample was left at 0°C, 25°C, and 50°C for 1 month, and then returned to room temperature, and was observed by visual observation and evaluated by the presence or absence of separation. In addition, the emulsified particle size of the water droplets after sample preparation was measured with a microscope. The smaller the average emulsified particles, the better the emulsification stability. If the average emulsification particle size exceeds 10 μm, separation tends to increase due to long-term storage.

、針入距離：10 mm、測定溫度：25℃之條件下加以測定。(3) Hardness Here, the "hardness" in the above is a rheometer (manufactured by Fudo Industries Co., Ltd.), with a needle diameter of 11.3 mm

1. The penetration distance: 10 mm and the measurement temperature: 25℃.

(4) Usability Ten professional functional inspectors conducted actual use tests on the prepared samples. Specifically, the prepared sample is applied to the face of each functional examiner, and the non-sticky feeling, smooth feeling, and lightness of spread are comprehensively evaluated according to the following criteria. <Evaluation criteria> A: Eight or more professional functional inspectors believe that the usability is excellent. B: Five or more professional functional inspectors and less than 8 considered excellent usability. C: There are 3 or more professional functional inspectors and less than 5 consider it excellent in usability. D: Less than 3 professional functional inspectors believe that the usability is excellent.

[Examples 1-8, Comparative Examples 1-7] Cosmetics were prepared using the formulations shown in Tables 1 and 2 below, and each characteristic was evaluated according to the above evaluation method. The results are shown in Table 1 and Table 2 together.

[Table 1]

[Table 2]

^{﹡ 1} KSG-16 (manufactured by Shin-Etsu Chemical Industry Company) ^{﹡ 2} DC9041 (manufactured by Dow Corning Toray Company) ^{﹡ 3} TOSPEARL 150KA (manufactured by Momentive Performance Materials) ^{﹡ 4} KSG-18A (manufactured by Shin-Etsu Chemical Industry Company) ^{﹡ 5} KSP-100 (Manufactured by Shin-Etsu Chemical Co., Ltd.) ^{﹡ 6} BY11-030 (manufactured by Dow Corning Toray) ^{﹡ 7} BENTONE 38VCG (manufactured by Elementis Japan) ^{﹡ 8} KF-6017P (manufactured by Shin-Etsu Chemical Industries) ^{﹡ 9} KF-6048 (Shin-Etsu Chemical Industries) (Made by the company) ^{﹡ 10} KF-6028 (made by Shin-Etsu Chemical Co., Ltd.)

As shown in the results of the table, the composition of the present invention containing a moisturizer, an oil phase tackifier, and an emulsifier (Example 1) can obtain a sufficient temperature-sensing effect, and also has excellent emulsification stability without stickiness. The sense of use is also good. Furthermore, in the compositions of Examples 2 to 8, the whitening agent can be stably formulated.

On the other hand, in the case where the amount of the oil-phase tackifier-free composition (Comparative Examples 1 to 3) and the amount of the oil-phase tackifier is small (Comparative Examples 4 and 5), the stability is significantly reduced and separation is performed. . In addition, the composition (Comparative Example 6) which does not contain any of polyether-modified polysiloxane and organically-modified clay minerals having a relatively high viscosity is significantly less stable. In addition, in the case where the amount of water blended is large (Comparative Example 7), a sufficient temperature-sensing effect cannot be obtained.

Claims (8)

A water-in-oil temperature-sensitive cosmetic, which contains: Polyol, Oil phase tackifier, Emulsifier, and water. As in the cosmetic of claim 1, the water content is 0.1 to 10% by mass. The cosmetics according to claim 1, wherein the emulsifier is a polyether-modified polysiloxane with a viscosity at 25°C of 10,000 mm ² /s or more. The cosmetic according to claim 1, wherein the emulsifier is lithium distearyl dimethyl ammonium bentonite. The cosmetic according to claim 1, wherein the above oil phase tackifier is a silicone elastomer. The cosmetics according to claim 1, wherein the blending amount of the above-mentioned oil phase tackifier is more than 1.25% by mass and 15% by mass or less. As in the cosmetics of claim 1, it further contains polyether-modified polysiloxane with a viscosity of less than 10,000 mm ² /s at 25°C. If the cosmetic of claim 1, it is further formulated with a whitening agent.